/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.wisii.wisedoc.area;

// Java
import java.util.List;

import org.xml.sax.SAXException;

import com.wisii.wisedoc.apps.FOUserAgent;
/**
 * This is the model for the area tree object. The model implementation can
 * handle the page sequence, page and off-document items. The methods to access
 * the page viewports can only assume the PageViewport is valid as it remains
 * for the life of the area tree model.
 */
public class AreaTreeModel {
	private List pageSequenceList = null;
	private int currentPageSequenceIndex = -1;
	/** the current page sequence */
	protected PageSequence currentPageSequence;
	// H private List offDocumentItems = new java.util.ArrayList();

	private FOUserAgent foUserAgent = null;
	
	/* 【添加：START】by 李晓光 2008-09-23  */
	public void reset(){
		currentPageSequenceIndex = -1;
		currentPageSequence = null;
		pageSequenceList.clear();
	}
	/* 【添加：END】by 李晓光 2008-09-23  */
	
	/** Create a new store pages model */
	public AreaTreeModel() {
		pageSequenceList = new java.util.ArrayList();
	}

	/**
	 * Start a page sequence on this model.
	 * 
	 * @param title
	 *            the title of the new page sequence
	 */
	public void startPageSequence(LineArea title) {
		currentPageSequence = new PageSequence(title);
		pageSequenceList.add(currentPageSequence);
		currentPageSequenceIndex = pageSequenceList.size() - 1;
	}

	/**
	 * Add a page to this model.
	 * 
	 * @param page
	 *            the page to add to the model.
	 */
	public void addPage(PageViewport page) {
		// foUserAgent.getPageViewportList().add(page.clone());

		// liuxiao20080801
		// foUserAgent.setPageViewportList(pp);

		currentPageSequence.addPage(page);
		int pageIndex = 0;
		for (int i = 0; i < currentPageSequenceIndex; i++) {
			pageIndex += ((PageSequence) pageSequenceList.get(i))
					.getPageCount();
		}
		pageIndex += currentPageSequence.getPageCount() - 1;
		page.setPageIndex(pageIndex);
		page.setPageSequence(currentPageSequence);

	}

	/**
	 * Handle an OffDocumentItem
	 * 
	 * @param ext
	 *            the extension to handle
	 */
	public void handleOffDocumentItem(OffDocumentItem ext) {
	};

	/**
	 * Signal the end of the document for any processing.
	 * 
	 * @throws SAXException
	 *             if a problem was encountered.
	 */
	public void endDocument() throws SAXException {
	};

	/**
	 * Get the page sequence count.
	 * 
	 * @return the number of page sequences in the document.
	 */
	public int getPageSequenceCount() {
		return pageSequenceList.size();
	}

	/**
	 * Get the page count.
	 * 
	 * @param seq
	 *            the page sequence to count.
	 * @return returns the number of pages in a page sequence
	 */
	public int getPageCount(int seq) {
		PageSequence sequence = (PageSequence) pageSequenceList.get(seq - 1);
		return sequence.getPageCount();
	}

	/**
	 * Get the page for a position in the document.
	 * 
	 * @param seq
	 *            the page sequence number
	 * @param count
	 *            the page count in the sequence
	 * @return the PageViewport for the particular page
	 */
	public PageViewport getPage(int seq, int count) {
		PageSequence sequence = (PageSequence) pageSequenceList.get(seq - 1);
		return sequence.getPage(count);
	}

	public FOUserAgent getFoUserAgent() {
		return foUserAgent;
	}

	public void setFoUserAgent(FOUserAgent foUserAgent) {
		this.foUserAgent = foUserAgent;
	}
}
